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G. A. HOBSON. METAL FLOORING 0R ROQFING..

N0. @804. Patented Mar. 1', 1892.

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V UNITED STATES PATENT OFFICE.

GEORGE ANDREWV HOBSON, OF RICHMOND, ENGLAND.

METAL FLOORING OR ROOFING.

SPECIFICATION forming part of Letters Patent No. 469,804, dated March 1,1892. Application filed June 16,1891. Serial No. 396,422. (No model.)Patented in England June 29, 1889,1I0. 10,565.

To all whom it may concern.-

Be it known that'I, GEORGE ANDREW HOB- SON, a subject of the Queen ofGreat Britain and Ireland, residing at Coverdale Lodge, Kings Road,Richmond, in the county of Surrey, in England, have invented certain newand useful Improvements in the Construction of Metal Floorings orRoofings for Bridges and other Structures; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it ap pertains tomake and use the same.

A patent for this invention has been obtained in England, No. 10,565,dated June 29, 1889. My invention relates to improvements in theconstruction of metal fioorings or roofings, whereby I obtain greatstrength and facility of construction, as every part is easilyaccessible to a hydraulic riveter or rivets are dispensed with.

In the accompanying drawings, Figures 1 and 2 show one construction ofsuch metal flooring or roofing, which consists of curved or bent platesA, secured together on the under side by iron or steel bars B of T orother section riveted between the lower ends of each plate. When thisconstruction is used for longitudinal railway-sleepers, as shown at theright-hand side of the two figures, they are held by brackets D, rivetedto the crown of the plates, and they can be made water-tight by fillingin the space 0 with a small quantity of asphalt. When used for aflooring, the

troughs are filled in with concrete or other suitable material to auniform level and a little above the top of the plates, as shown at theleft-hand side of the two figures. By preference the width of the T-ironemployed is such that the gap of even small hydraulic. riveters willpass over it.

In I the construction shown in Fig. 3 the curved or bent plates A aresecured together by placing the edges of the two adjacent plates in ironor steel bars B of channel-section, in which they are retained by thebolts H, connecting the channel-bars with stay-plates I, resting on thecurved or bent plates.

In the construction shown in Fig. 4 I use the iron work, as described,and according to another of my improvements I provide it with a fire andsound 'proof covering, consisting of the symmetrical segments a a, soshaped at their lower ends as to hold the bars I) b and bear upon theiron work, as at 0, both the segments and bars being of any suitablecomposition and molded or ornamented, as desired. Above the metalstructure the flooring may be formed of a layer of fire and sound proofcomposition (1, over which a covering of cement or concrete may be laid.

An important advantage of these constructions of fioorings or roofingsis that ordinary plates and trade-sections of iron can be used which areeasily obtainable Having fully described. my invention, what I claim,and desire to secure by Letters Patent, is

A metal flooring or roofing consisting of a series of arched plates anda series of inverted bars of T-section, the tables of the said barsbeing arranged below the edges of the plates, and the vertical webs ofthe bars being interposed between the ends of the plates and riveted tothem, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE ANDREW HOBSON.

Vitnesses:

WALTER ERNEST KAYES, JOHN P. ODoNNELL.

